﻿238 
  

  

  E. 
  RAY 
  LANKES'l'EK. 
  

  

  All 
  Araclmidaj 
  includiug 
  Limulus, 
  feed 
  by 
  suctorial 
  action 
  

   in 
  essentially 
  tlie 
  same 
  way 
  as 
  Scorpio. 
  

  

  Scorpions 
  of 
  various 
  species 
  have 
  been 
  observed 
  to 
  make 
  a 
  

   hissing 
  noise 
  when 
  disturbed, 
  or 
  even 
  when 
  not 
  disturbed. 
  

   The 
  sound 
  is 
  produced 
  by 
  stridulating 
  organs 
  developed 
  on 
  

   the 
  basal 
  joints 
  of 
  the 
  limbs, 
  which 
  differ 
  in 
  position 
  and 
  

   character 
  in 
  different 
  genera 
  (see 
  Pocock 
  [27]). 
  Scorpions 
  

   copulate 
  with 
  the 
  ventral 
  surfaces 
  iu 
  contact. 
  The 
  eggs 
  are 
  

   fertilised, 
  practically 
  in 
  the 
  ovary, 
  and 
  develop 
  in 
  situ. 
  The 
  

  

  Fig. 
  53. 
  

  

  Fig. 
  52. 
  

  

  Tig. 
  52. 
  — 
  Drawing 
  from 
  life 
  of 
  the 
  Italian 
  Scorpion 
  Euscorpius 
  

   italicus, 
  Herbst, 
  holding 
  a 
  blue-bottle 
  fly 
  with 
  its 
  left 
  chela 
  and 
  care- 
  

   fully 
  piercing 
  it 
  between 
  head 
  and 
  thorax, 
  with 
  its 
  sting. 
  Two 
  insertions 
  

   of 
  the 
  sting 
  are 
  efifected, 
  and 
  the 
  fly 
  is 
  instantly 
  paralysed 
  by 
  the 
  poison 
  

   so 
  introduced 
  into 
  its 
  body. 
  (From 
  Lankester, 
  ' 
  Journ. 
  Linn. 
  Soc.') 
  

  

  Fig. 
  53. 
  — 
  The 
  same 
  Scorpion 
  carrying 
  the 
  now 
  paralysed 
  fly 
  held 
  in 
  

   its 
  chelicerse, 
  the 
  chelae 
  liberated 
  for 
  attack 
  and 
  defence. 
  Drawn 
  from 
  

   life. 
  (From 
  Laukester, 
  * 
  Journ. 
  Linn. 
  Soc.') 
  

  

  young 
  are 
  born 
  fully 
  formed, 
  and 
  are 
  carried 
  by 
  the 
  mother 
  

   on 
  her 
  back. 
  As 
  many 
  as 
  thirty 
  have 
  been 
  counted 
  in 
  a 
  

   brood. 
  For 
  information 
  as 
  to 
  the 
  embryology 
  of 
  scorpions 
  

   the 
  reader 
  is 
  referred 
  to 
  the 
  works 
  named 
  in 
  the 
  bibliography 
  

   on 
  p. 
  265. 
  Scorpions 
  do 
  not 
  possess 
  spinning 
  organs, 
  nor 
  form 
  

   either 
  snares 
  or 
  nests 
  so 
  far 
  as 
  is 
  known; 
  but 
  some 
  species 
  

  

  